Lie on your back with your knees bent and your feet flat on the floor (A). Arch your back so that your pubic bone feels like it's pointing toward your feet (B). Hold for five seconds and then relax. Flatten your back, pulling your bellybutton toward the floor so that your pubic bone feels like it's pointing toward your head (C). Hold for five seconds and then relax. Repeat. Start with five repetitions each day and gradually work up to 30.

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